JPH0699193B2 - Porous fiber ceramic soil improvement material manufacturing method and soil improvement method - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to a method for producing a porous fiber-ceramic soil-improving material containing inorganic fibers and ceramic raw material powder as main components, and a method for improving soil quality.

2. Description of the Related Art In recent years, a method of using a porous ceramic has been used to improve a sandy land with poor water retention such as a beach.
However, the porous ceramic used here is obtained by mixing carbon particles, plastic particles, etc. into the ceramic raw material powder, and then molding it into pellets and firing it. The rest had a structure to store water. The water retention was improved by mixing the porous ceramic pellets obtained in this way with sand. With this method, only part of the water that was irrigated could be retained, and most were left to drain.

DISCLOSURE OF THE INVENTION Problems to be Solved by the Invention In the method for producing a porous ceramic pellet described in the conventional example, in order to maintain the strength of the pellet, it is impossible to greatly increase the porosity and the maximum is 40 to 50%. It was Therefore, there is a point that the amount of water retention is small, the irrigation must be frequently performed, which is troublesome and economically disadvantageous. In addition, the method of mixing the sand with the sand can retain only a part of the water that was irrigated, and most of them were left to be washed away. In addition, the water that has been washed away absorbs salt from the deep part of the gravel layer due to osmotic pressure, causing salt damage.

The present invention aims to solve such problems of the conventional technology.

Means for Solving the Problems The present invention is a method of wet-fabricating a slurry of an inorganic ceramic fiber and a ceramic raw material powder into a mat or a sheet, and then the sheet is further molded into a corrugated honeycomb shape and then fired. The obtained soil improvement agent is made of a porous fiber ceramic.

In addition, the water retention layer is constructed by laying this porous fiber ceramic soil improvement material inside the gravel layer,
The irrigated water is stored without being washed away.

Effect The porous fiber-ceramic soil improving material of the present invention uses ceramic fibers as a basic material and is excellent in hydrophilicity,
In addition, it has a porosity of 75-85%, the fibers to be created by the papermaking method are mainly oriented in the plane, and the pores that are configured are capillary and are all continuous. A material excellent in water absorption and water retention can be obtained.

Further, this material is made into a sheet and made into a corrugated shape in which one end surface is closed, and then laminated or rolled up while the same end surface is closed and molded, and a corrugated honeycomb structure is obtained by firing to further improve water retention performance. Can be improved.

By embedding these porous fiber ceramic soil improving materials in a layered manner inside a gravel layer to form a water retaining layer, irrigated water is once stored in this water retaining layer. After that, as the upper layer is dried, the water stored in the water retaining layer moves so as to supplement the water content of the upper layer, and the upper layer can be prevented from being dried. In addition, this water retention layer has the same effect as the groundwater vein, and can supply sufficient water to the roots of plants.

Embodiments Embodiments of the present invention will be described below with reference to the drawings.

Example 1 As the ceramic fiber, silica-alumina fiber having an average diameter of about 3 μm was used. This silica-alumina fiber has a fiber length of 10
20 parts by weight of the product adjusted to mm was weighed and suspended in 1000 parts by weight of water. On the other hand, as the ceramic raw material powder, kaolinite, spodium, and amorphous silicon oxide powder are 2: 2:
6 parts by weight of the mixture mixed in the ratio of 1 were suspended in 50 parts by weight of water. The fiber suspension and the ceramic raw material powder suspension were mixed with stirring. To this suspension, 1 part by weight of a polyester dispersion liquid as an organic binder was added, mixed sufficiently with stirring, and then neutralized by adding an aluminum chloride solution and a sodium hydroxide solution to form an aluminum hydroxide colloid. , Cause primary aggregation. This is mainly for agglomeration of ceramic fibers and ceramic raw material powder. Next, by adding a necessary amount of a polyacrylamide-based organic polymer aggregating solution as a secondary aggregating agent, the ceramic fibers and the ceramic raw material powder form flocs and are suspended. The flocculated suspension thus obtained is diluted with water to 3000 parts by weight, transferred to a mold for a mat-shaped molded product, sucked and dehydrated, taken out from the mold, dried and then matted with a polyester fiber. A molded body was obtained. When this mat-shaped compact is fired at 1250 ° C. for 2 hours, the organic matter is burned down, and the ceramic fibers and the ceramic raw material powder are sintered and bonded to each other to form a fiber ceramic.
A soil improvement material 1 of porous fiber ceramic as shown in FIG. 1 was obtained.

The mat-like porous fiber-ceramic soil improving material 1 had a bulk density of 0.4 g / cm ³ and a porosity of 85%. The mat-like porous fiber ceramic soil improving material was soaked in water and then pulled up to measure the amount of water retention at the time when water dripping disappeared. As a result, the material of 30 cm square and 1.5 cm thick was kept at 680 ml.

Example 2 With the same composition of materials as in Example 1, the primary coagulation was similarly completed with a solution of aluminum chloride and sodium hydroxide, and then a polyacrylamide organic polymer coagulant solution was added to completely complete the secondary coagulation. Was completed, diluted to 5,000 parts by weight with water, made into paper by an ordinary Fourdrinier paper machine, and dried to obtain a 0.75 mm thick sheet. Using a normal corrugated board manufacturing machine, this sheet was sprayed with steam to give it moderate flexibility, and then corrugated, and one end was made of plastic plug material. While injecting, another sheet which was similarly sprayed with water vapor was stuck as it was using an adhesive to obtain a corrugated sheet with one end closed. Here, the plug raw material was prepared according to the following.

The sheet obtained above is calcined at 1000 ° C. and crushed to a size of 0.5 mm or less. The same amount of starch paste as this powder was added and thoroughly mixed to obtain a plastic plug raw material.

Next, after filling the corrugated portion at the same end of the corrugated sheet with one end closed with the plug raw material, the adhesive was applied to the corrugated top and continuously rolled up to form a molding.
The obtained molded body was fired in an electric furnace at 1250 ° C. for 3 hours to obtain a soil improving material made of a porous fiber ceramic. FIG. 2 shows the soil improvement material 2 obtained in this example. 3 is an open end. FIG. 3 is a schematic view showing a vertical cross section of the soil improvement material 2 of this example. Reference numeral 4 denotes a honeycomb cell, one end of which is closed by a plug 5 to form a closed end 6. This corrugated honeycomb-shaped soil improvement material 2 has a diameter of 265 mm and a height of 3
Soak the 00mm thing in the water with the closed end down and pull it up.
When the amount of water retention was measured after the water dripping disappeared, it was 10
kept l. By adopting such a corrugated honeycomb structure, the honeycomb cell 4 made of fiber ceramics
Not only is water retained on the walls that make up the honeycomb, but water is also stored in the honeycomb cells, so it is possible to retain up to 60% of the total volume of water.

Furthermore, as a result of applying the vinyl chloride emulsion solution to the outer periphery and closed end of the soil improvement material excluding the open end and drying and applying water repellent treatment, the same measurement was performed. there were. This is because water cannot penetrate into the water-repellent portion of the capillary and the internal water is supported by the surface tension at that portion, which is 80% of the total volume.

Example 3 FIG. 4 shows an application example using the soil improvement materials 1 and 2. The soil improvement material 2 was spread in at least two steps inside the gravel layer 7, and the mat improvement material 1 was covered thereover to prevent sand from entering the honeycomb cells. The water irrigated by such a facility permeates the gravel layer 7-a, reaches the water retaining layer 8 and is retained and stored. As the gravel layer 7-a is dried, water is supplied from the water retaining layer 8 to the gravel layer 7-a to prevent the gravel layer 7-a from being dried. On the other hand, the irrigated water rarely leaks to the gravel layer 7-b below the water retaining layer 8 and does not cause an increase in salt from the deep portion. In addition, the flow of fertilizer components can be prevented, and the fertilizer applied can be effectively used.

Here, instead of using the mat-like soil improving material 1, even if the soil improving material 2 in which the open end portion 3 of the corrugated honeycomb-shaped soil improving material 2 is filled with the porous plug material is used, the effect does not change. .

EFFECTS OF THE INVENTION The present invention provides a mat-like or corrugated honeycomb-shaped soil-improving material that is rich in water retention and is made of a porous fiber ceramic.

That is, the skeleton is formed of fiber ceramics, and the capillaries are connected vertically and horizontally, and the material itself
Since it has a porosity of 75 to 85%, it has excellent water absorption and water retention performance. Furthermore, by using this material to form a corrugated honeycomb shape, the porosity can be increased to 92%, further improving the water retention capacity. I was able to make it happen. Also,
By constructing a water retention layer inside the gravel layer using this soil improvement material, the irrigated water is not wasted, the runoff of fertilizer components is prevented, and effective and effective soil improvement without causing salt damage. It is something that can be taken.

[Brief description of drawings]

FIG. 1 is a partial perspective view of a mat-shaped soil improving material made of a porous fiber ceramic soil improving material of one embodiment of the present invention, and FIG. 2 is a perspective view of a corrugated honeycomb-shaped soil improving material of the same embodiment, FIG. 3 is a schematic cross-sectional view of the soil improvement material shown in FIG. 2, and FIG. 4 is a perspective view showing an embodiment of a soil improvement method using the soil improvement material of the present invention. 1, 2 ... soil improvement material, 3 ... open end, 6 ... closed end, 8 ... water retaining layer.

 ─────────────────────────────────────────────────── ─── Continuation of the front page (56) References JP-A-61-215278 (JP, A) JP-A-63-288973 (JP, A) Actually-opened JP-A 64-14247 (JP, U)

Claims (5)

[Claims] 1. A mat-shaped molded body obtained by paper-forming an aggregated slurry obtained by adding an aggregating agent to a slurry of inorganic fibers and ceramic raw material powder to agglomerate the inorganic fibers and ceramic raw material powder into a ceramic by sintering. A method for producing a porous fiber-ceramic soil improvement material, characterized by 2. A sheet obtained by forming a coagulated slurry in which an inorganic fiber and a ceramic raw material powder are coagulated with each other by adding a coagulant to a slurry of the inorganic fiber and the ceramic raw material powder is formed into a corrugated cardboard shape and rolled up or laminated. A method for producing a porous fiber-ceramic soil improvement material, which is in the shape of a corrugated honeycomb which is subsequently sintered and made into a ceramic. 3. The method for producing a porous fiber ceramic soil improving material according to claim 2, wherein the corrugated honeycomb cell opening facing at least one end is closed. 4. The method for producing a porous fiber ceramic soil improving material according to claim 2, wherein the outer peripheral portion of the corrugated honeycomb except at least cell opening end faces is subjected to water repellent treatment. 5. A soil improvement method, which comprises forming a layer in which a porous fiber ceramic soil improvement material is spread inside a gravel layer.